https://www.gamespot.com/articles/someone-already-beat-destiny-2s-harder-prestige-mo/1100-6454172/

Not much more than an hour after it first went live in Destiny 2 on PS4 and Xbox One, the Prestige version of Leviathan--effectively the Raid's hard mode--has already been beaten. Bungie has confirmed that at least one team has already emerged victorious.

This Prestige Raid was supposed to arrive last week alongside the now-concluded Iron Banner. However, Bungie discovered an exploit that negated the Raid's difficulty. As a result, the Prestige Raid was delayed to work on a fix. That still isn't ready, but rather than delay it further, Bungie will monitor the Raid to detect teams that make use of the exploit. Meanwhile, the latest Nightfall Strike has been replaced due to a bug.